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Subject:EI07036 - End of Request for Front Windshield Glass Optical Distortion or Stress Cracks (Enginering Information) #07-08-48-001A - (03/28/2007)


Models:2007 Cadillac Escalade, Escalade ESV, Escalade EXT
2007 Chevrolet Avalanche, Silverado (New Body Style), Suburban, Tahoe
2007 GMC Sierra (New Body Style), Yukon, Yukon XL
Built On or After September 1, 2006


This bulletin is being issued to cancel Corporate Bulletin Number 07-08-48-001 and end the request for Engineering Information (EI07036). Please discard Corporate Bulletin Number 07-08-48-001 (Section 08 -- Body & accessories).
Resolution

Through the information gained from this service bulletin, a series of incremental engineering changes are being reviewed and the appropriate response/action will be taken to address this concern. Thank You to all those who offered your timely and valuable assistance in support of this effort.
Instructions

If the customer brings a vehicle in with one of these concerns, no special action is required. Follow normal review/replacement procedures.


Subject:Front Windshield Cracked / Engineering Investigation - keywords body front glass #PIT3952A - (01/17/2007)



Models:2007 Cadillac Escalade, ESV, EXT
2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL



This PI was updated to revise recommendations. Please discard PIT3952.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:

A vehicle may be brought in for a customer concern of stress-cracked windshield or visible distortion. There is an engineering investigation for front windshields with a stress crack or visible distortion (items being viewed through glass appear distorted or blurry when looking through some portion of the glass). This engineering investigation is for North America.
Recommendation/Instructions:
  1. <LI type=1>Check the vehicle build date. Respond to this only if the vehicle was built on/after 09/01/06. Record the vehicle build date. <LI type=1>If the glass is cracked, verify that the crack occurred due to stress (not caused by impact). Disregard this bulletin if the crack was not caused by stress. <LI type=1>Record the information stamped on the bottom right corner of the glass (write down or photograph). You will see some number of dots before or after a "6" or "7". In many cases, you'll also see a number of dots before or after a "D" and an "S". This is the production date code for the glass. The information always tells us month and year of build of the glass, and sometimes tells us Day and Shift. Number, location, and orientation of dots, relative to the number or letter, is important. <LI type=1>Gather details about the crack or distortion problem:
    For STRESS CRACKS, record: The exact location of the crack's origin. Did the crack originate at one of the edges of the windshield (A pillar, cowl, roof) or away from all edges? How far, in and up, is the crack's origin (from some reference point)? Which direction did the crack run (straight up/out or at a diagonal)? Did the customer provide additional information regarding the crack (e.g. noticed/did something prior to crack forming)?
    For DISTORTION, record: Nature, location/area, and size of the distortion. Where is the viewer sitting and looking when he/she sees a distorted view? What is distorted about the view (e.g. all is blurry, horizontal lines look wavy, vertical lines look wavy)?​
    <LI type=1>Please do not replace the glass.
  2. Contact xxxxxxxxxxxxx, GM Warranty Engineer, at (248) xxxxxxxx and provide: Vehicle build date, VIN#, RO#, date code information from the stamp on the glass, issue detail (see #3 above, details about the crack or distortion problem).
Engineering may visit dealerships which are near Detroit, MI (within 2 hours) or close to one of the Full Size Truck assembly plants. GM or the windshield supplier may make arrangements to have the glass shipped to a chosen facility. In either case, a decision will be made based upon the information provided. Feedback/Disposition will be provided to you within 48 hours of phone call.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
 
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